beautiful eye colour btw, Your mother has green eyes meaning that the allele was dominant to the brown from her dad or he probably had a recessive gene in him due to your mother having green eyes or your mother was just lucky since your grandma has green eyes meaning she would get a 25% of receiving green eyes due to brown being rather dominant. YOUR eye colour is a mutation from both of your parents.
Hoped it helped

g= green eyes gen b = brown eyes gen
b is dominant so if there is a mix of b and g you get brown eyes , to have green eyes you need 2g's when you have children you pass on 1 gen , if you have mixed gen you can pas on either one
so your grandmother is gg and your grandfather is either bb or bg
but since your mother has green eyes , its safe to say your grandfather is bg and passed on the green eyes gen , since your grandmother is gg she passed on a g aswell resulting in 2g's , giving your mother green eyes

Do you know where the myth of unicorns most likely orginated? From narwhals.

The viking who vent to Vinland(america) had a habit of sometimes hunting narwhals for their horn, even though it was a rater dangerous and hard hunt. One part because the vikings were not using harpoons but normal spears to hunt them. If the horn managed to reach eastern Europe or farther it would raise a sum worth a duchy each. As the horn was rumored to cure any illness or pain the nobles went head over shoulder to get their hands on them.